import numpy as np
import cv2

# Load an color image in grayscale
img = cv2.imread('messi5.jpg',0)

cv2.imshow('image',img)
cv2.waitKey(0)
cv2.destroyAllWindows()

cv2.imwrite('messigray.png',img)

import os
path = r'C:\BAWEIJIAOYU\temp\CV\1904a_cvexe\day01\messigray.png'
os.remove(path)


# ======== put them togather
import numpy as np
import cv2

img = cv2.imread('messi5.jpg',1)
cv2.imshow('image',img)
k = cv2.waitKey(0)
if k == 27:         # wait for ESC key to exit
    cv2.destroyAllWindows()
elif k == ord('s'): # wait for 's' key to save and exit
    cv2.imwrite('messicolor.png',img)
    cv2.destroyAllWindows()
